Vertical axis wind turbine models

Two blade V rotor VAWT model

The blades of this rotor are made of card crudely formed into a symmetrical aerofoil section. They are angled out from the hub at approximately 45 degrees. The blades will be operating at a range of relative wind speeds depending on the position along the blade. The geometry suggests that the air flow across the angled blade will be at a lower angle of attack compared to a perpendicular blade. The rotor should also work when the air flow is not directly on the side of the rotor.

Radius

313mm

Number blades

2

Blade chord

104mm

Blade thickness

25mm

Blade thickness (%)

24%

Blade length

338mm

Frontal area

85100mm2

Density

0.82

Blade area / frontal area

This seems to start up and run more easily than the equivalent 2 blade H rotor and doesn't have the same vibration.